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Re: [Amps] Input relay for QSK amp

To: Bob Maser <>
Subject: Re: [Amps] Input relay for QSK amp
From: Jim <>
Date: Sat, 8 Dec 2018 22:42:33 -0600
List-post: <>
Not necessarily!

Really there no need for a faster input relay or a faster output relay. That is all false logic.

I matters NOT which relay closes or opens first... AS LONG AS the RF is not sent from the radio BEFORE the relays are closed and ready to take RF.

AND the RF STOPS flowing before the relay DE-energise.  That's ALL that is needed.


Jim W7RY

On 12/7/2018 9:16 PM, Bob Maser wrote:
I must be old school.  The input relays need to be slower than the output relay. Seems to me that a RJ-1 takes 8ms to close and stop bouncing around. I have always used a P&B miniature open frame DPDT for that purpose.  The output of the amp needs
to be closed before the input turns on.

On Fri, Dec 7, 2018 at 9:39 PM Jim < <>> wrote:

    Those relays that Rich (and I ) used are mostly unavailable. I
    used to
    buy them 100s at a time. No more of them can be had.

    Most of what you find on eBay are seconds and most don't work. Or
    are re-labeled counterfeits.

    Jim W7RY

    On 12/4/2018 4:03 PM, Alek Petkovic wrote:
    > G'day Vic.
    > The Matsushita/Panasonic relay that Rich Measures used in his QSK
    > circuit, published at <>, is still
    available on Ebay. I bought
    > 10 of them a couple of years ago
    > Otherwise, Jim, W7RY, uses a small relay in his QSK kit. He laso
    > on Ebay.
    > 73, Alek.
    > VK6APK
    > On 4/12/2018 6:21 PM, Victor Rosenthal 4X6GP wrote:
    >> I'm trying to choose a relay to use as the input relay in a QSK
    >> I have been very satisfied with the Jennings RJ1-A as an output
    >> relay. The input relay in this circuit needs to be DPDT, or I'd
    >> use two similar vacuum relays.
    >> Here are my needs:
    >> 1. DPDT.
    >> 2. 12 or 24v coil.
    >> 3. Operate/release time, including bounce <= 4 ms. Faster is
    >> 4. Should carry 100w RF in 50 ohm system. Not expected to
    >> live circuit.
    >> 5. Must have low resistance for low-level signals (receive path).
    >> 6. Must have long life >= (10 x 10**6 operations)
    >> 7. Must not be insanely expensive, and available from Mouser or RS.
    >> I found this relay:
    >> But maybe there's a better choice? I'm overwhelmed by the
    number and
    >> varieties of relays in the catalog.
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